SUPPLEMENTARY INFORMATION Schedule of Other Operating Cost and Expense, by Component (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Property Costs, net of impairment [Member]
Business Interruption Loss [Line Items]
Insurance Recoveries	$ 7	$ 1
Business interruption and clean up costs, net [Member]
Business Interruption Loss [Line Items]
Insurance Recoveries	$ 7	$ 1

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_InsuranceRecoveries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration